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package org.glassfish.config.support;

import static java.lang.String.format;
import static java.util.logging.Level.WARNING;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

import org.jvnet.hk2.config.ConfigBeanProxy;

public class GlassFishStubBean implements InvocationHandler {

    private static final Logger LOGGER = Logger.getLogger(GlassFishStubBean.class.getName());

    private final Map<String, Object> getterResults;

    private GlassFishStubBean(ConfigBeanProxy bean) {
        this.getterResults = new HashMap<>();
        for (Method m : bean.getClass().getMethods()) {
            final String methodName = m.getName();
            if (methodName.startsWith("get") && !methodName.equals("getParent") && m.getParameterTypes().length == 0) {
                try {
                    getterResults.put(methodName, m.invoke(bean));
                } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
                    LOGGER.log(WARNING, format("Failed to call getter method \"%s\" for config bean \"%s\".",
                            methodName, bean.getClass().getSimpleName()), ex);
                }
            }
        }
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        return getterResults.get(method.getName());
    }

    public static <T extends ConfigBeanProxy> T cloneBean(T configBean, Class<T> interfaceClass) {
        return (T) Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[]{interfaceClass}, new GlassFishStubBean(configBean));
    }

}